summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
blob: c0155c6271bf8935f9b1c967a9d2fd739fc4f074 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2021 Microsoft
 *
 * Portions of this code is derived from hyperv_fb.c
 */

#include <linux/hyperv.h>

#include <drm/drm_print.h>
#include <drm/drm_simple_kms_helper.h>

#include "hyperv_drm.h"

#define VMBUS_RING_BUFSIZE (256 * 1024)
#define VMBUS_VSP_TIMEOUT (10 * HZ)

#define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
#define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
#define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
#define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)

#define SYNTHVID_DEPTH_WIN7 16
#define SYNTHVID_DEPTH_WIN8 32
#define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
#define SYNTHVID_WIDTH_MAX_WIN7 1600
#define SYNTHVID_HEIGHT_MAX_WIN7 1200

enum pipe_msg_type {
	PIPE_MSG_INVALID,
	PIPE_MSG_DATA,
	PIPE_MSG_MAX
};

enum synthvid_msg_type {
	SYNTHVID_ERROR			= 0,
	SYNTHVID_VERSION_REQUEST	= 1,
	SYNTHVID_VERSION_RESPONSE	= 2,
	SYNTHVID_VRAM_LOCATION		= 3,
	SYNTHVID_VRAM_LOCATION_ACK	= 4,
	SYNTHVID_SITUATION_UPDATE	= 5,
	SYNTHVID_SITUATION_UPDATE_ACK	= 6,
	SYNTHVID_POINTER_POSITION	= 7,
	SYNTHVID_POINTER_SHAPE		= 8,
	SYNTHVID_FEATURE_CHANGE		= 9,
	SYNTHVID_DIRT			= 10,
	SYNTHVID_RESOLUTION_REQUEST	= 13,
	SYNTHVID_RESOLUTION_RESPONSE	= 14,

	SYNTHVID_MAX			= 15
};

struct pipe_msg_hdr {
	u32 type;
	u32 size; /* size of message after this field */
} __packed;

struct hvd_screen_info {
	u16 width;
	u16 height;
} __packed;

struct synthvid_msg_hdr {
	u32 type;
	u32 size;  /* size of this header + payload after this field */
} __packed;

struct synthvid_version_req {
	u32 version;
} __packed;

struct synthvid_version_resp {
	u32 version;
	u8 is_accepted;
	u8 max_video_outputs;
} __packed;

struct synthvid_vram_location {
	u64 user_ctx;
	u8 is_vram_gpa_specified;
	u64 vram_gpa;
} __packed;

struct synthvid_vram_location_ack {
	u64 user_ctx;
} __packed;

struct video_output_situation {
	u8 active;
	u32 vram_offset;
	u8 depth_bits;
	u32 width_pixels;
	u32 height_pixels;
	u32 pitch_bytes;
} __packed;

struct synthvid_situation_update {
	u64 user_ctx;
	u8 video_output_count;
	struct video_output_situation video_output[1];
} __packed;

struct synthvid_situation_update_ack {
	u64 user_ctx;
} __packed;

struct synthvid_pointer_position {
	u8 is_visible;
	u8 video_output;
	s32 image_x;
	s32 image_y;
} __packed;

#define SYNTHVID_CURSOR_MAX_X 96
#define SYNTHVID_CURSOR_MAX_Y 96
#define SYNTHVID_CURSOR_ARGB_PIXEL_SIZE 4
#define SYNTHVID_CURSOR_MAX_SIZE (SYNTHVID_CURSOR_MAX_X * \
	SYNTHVID_CURSOR_MAX_Y * SYNTHVID_CURSOR_ARGB_PIXEL_SIZE)
#define SYNTHVID_CURSOR_COMPLETE (-1)

struct synthvid_pointer_shape {
	u8 part_idx;
	u8 is_argb;
	u32 width; /* SYNTHVID_CURSOR_MAX_X at most */
	u32 height; /* SYNTHVID_CURSOR_MAX_Y at most */
	u32 hot_x; /* hotspot relative to upper-left of pointer image */
	u32 hot_y;
	u8 data[4];
} __packed;

struct synthvid_feature_change {
	u8 is_dirt_needed;
	u8 is_ptr_pos_needed;
	u8 is_ptr_shape_needed;
	u8 is_situ_needed;
} __packed;

struct rect {
	s32 x1, y1; /* top left corner */
	s32 x2, y2; /* bottom right corner, exclusive */
} __packed;

struct synthvid_dirt {
	u8 video_output;
	u8 dirt_count;
	struct rect rect[1];
} __packed;

#define SYNTHVID_EDID_BLOCK_SIZE	128
#define	SYNTHVID_MAX_RESOLUTION_COUNT	64

struct synthvid_supported_resolution_req {
	u8 maximum_resolution_count;
} __packed;

struct synthvid_supported_resolution_resp {
	u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
	u8 resolution_count;
	u8 default_resolution_index;
	u8 is_standard;
	struct hvd_screen_info supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
} __packed;

struct synthvid_msg {
	struct pipe_msg_hdr pipe_hdr;
	struct synthvid_msg_hdr vid_hdr;
	union {
		struct synthvid_version_req ver_req;
		struct synthvid_version_resp ver_resp;
		struct synthvid_vram_location vram;
		struct synthvid_vram_location_ack vram_ack;
		struct synthvid_situation_update situ;
		struct synthvid_situation_update_ack situ_ack;
		struct synthvid_pointer_position ptr_pos;
		struct synthvid_pointer_shape ptr_shape;
		struct synthvid_feature_change feature_chg;
		struct synthvid_dirt dirt;
		struct synthvid_supported_resolution_req resolution_req;
		struct synthvid_supported_resolution_resp resolution_resp;
	};
} __packed;

static inline bool hyperv_version_ge(u32 ver1, u32 ver2)
{
	if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
	    (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
	     SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
		return true;

	return false;
}

static inline int hyperv_sendpacket(struct hv_device *hdev, struct synthvid_msg *msg)
{
	static atomic64_t request_id = ATOMIC64_INIT(0);
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	int ret;

	msg->pipe_hdr.type = PIPE_MSG_DATA;
	msg->pipe_hdr.size = msg->vid_hdr.size;

	ret = vmbus_sendpacket(hdev->channel, msg,
			       msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
			       atomic64_inc_return(&request_id),
			       VM_PKT_DATA_INBAND, 0);

	if (ret)
		drm_err(&hv->dev, "Unable to send packet via vmbus\n");

	return ret;
}

static int hyperv_negotiate_version(struct hv_device *hdev, u32 ver)
{
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf;
	struct drm_device *dev = &hv->dev;
	unsigned long t;

	memset(msg, 0, sizeof(struct synthvid_msg));
	msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_version_req);
	msg->ver_req.version = ver;
	hyperv_sendpacket(hdev, msg);

	t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT);
	if (!t) {
		drm_err(dev, "Time out on waiting version response\n");
		return -ETIMEDOUT;
	}

	if (!msg->ver_resp.is_accepted) {
		drm_err(dev, "Version request not accepted\n");
		return -ENODEV;
	}

	hv->synthvid_version = ver;
	drm_info(dev, "Synthvid Version major %d, minor %d\n",
		 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));

	return 0;
}

int hyperv_update_vram_location(struct hv_device *hdev, phys_addr_t vram_pp)
{
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf;
	struct drm_device *dev = &hv->dev;
	unsigned long t;

	memset(msg, 0, sizeof(struct synthvid_msg));
	msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_vram_location);
	msg->vram.user_ctx = vram_pp;
	msg->vram.vram_gpa = vram_pp;
	msg->vram.is_vram_gpa_specified = 1;
	hyperv_sendpacket(hdev, msg);

	t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT);
	if (!t) {
		drm_err(dev, "Time out on waiting vram location ack\n");
		return -ETIMEDOUT;
	}
	if (msg->vram_ack.user_ctx != vram_pp) {
		drm_err(dev, "Unable to set VRAM location\n");
		return -ENODEV;
	}

	return 0;
}

int hyperv_update_situation(struct hv_device *hdev, u8 active, u32 bpp,
			    u32 w, u32 h, u32 pitch)
{
	struct synthvid_msg msg;

	memset(&msg, 0, sizeof(struct synthvid_msg));

	msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_situation_update);
	msg.situ.user_ctx = 0;
	msg.situ.video_output_count = 1;
	msg.situ.video_output[0].active = active;
	/* vram_offset should always be 0 */
	msg.situ.video_output[0].vram_offset = 0;
	msg.situ.video_output[0].depth_bits = bpp;
	msg.situ.video_output[0].width_pixels = w;
	msg.situ.video_output[0].height_pixels = h;
	msg.situ.video_output[0].pitch_bytes = pitch;

	hyperv_sendpacket(hdev, &msg);

	return 0;
}

/*
 * Hyper-V supports a hardware cursor feature. It's not used by Linux VM,
 * but the Hyper-V host still draws a point as an extra mouse pointer,
 * which is unwanted, especially when Xorg is running.
 *
 * The hyperv_fb driver uses synthvid_send_ptr() to hide the unwanted
 * pointer, by setting msg.ptr_pos.is_visible = 1 and setting the
 * msg.ptr_shape.data. Note: setting msg.ptr_pos.is_visible to 0 doesn't
 * work in tests.
 *
 * Copy synthvid_send_ptr() to hyperv_drm and rename it to
 * hyperv_hide_hw_ptr(). Note: hyperv_hide_hw_ptr() is also called in the
 * handler of the SYNTHVID_FEATURE_CHANGE event, otherwise the host still
 * draws an extra unwanted mouse pointer after the VM Connection window is
 * closed and reopened.
 */
int hyperv_hide_hw_ptr(struct hv_device *hdev)
{
	struct synthvid_msg msg;

	memset(&msg, 0, sizeof(struct synthvid_msg));
	msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_pointer_position);
	msg.ptr_pos.is_visible = 1;
	msg.ptr_pos.video_output = 0;
	msg.ptr_pos.image_x = 0;
	msg.ptr_pos.image_y = 0;
	hyperv_sendpacket(hdev, &msg);

	memset(&msg, 0, sizeof(struct synthvid_msg));
	msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_pointer_shape);
	msg.ptr_shape.part_idx = SYNTHVID_CURSOR_COMPLETE;
	msg.ptr_shape.is_argb = 1;
	msg.ptr_shape.width = 1;
	msg.ptr_shape.height = 1;
	msg.ptr_shape.hot_x = 0;
	msg.ptr_shape.hot_y = 0;
	msg.ptr_shape.data[0] = 0;
	msg.ptr_shape.data[1] = 1;
	msg.ptr_shape.data[2] = 1;
	msg.ptr_shape.data[3] = 1;
	hyperv_sendpacket(hdev, &msg);

	return 0;
}

int hyperv_update_dirt(struct hv_device *hdev, struct drm_rect *rect)
{
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct synthvid_msg msg;

	if (!hv->dirt_needed)
		return 0;

	memset(&msg, 0, sizeof(struct synthvid_msg));

	msg.vid_hdr.type = SYNTHVID_DIRT;
	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_dirt);
	msg.dirt.video_output = 0;
	msg.dirt.dirt_count = 1;
	msg.dirt.rect[0].x1 = rect->x1;
	msg.dirt.rect[0].y1 = rect->y1;
	msg.dirt.rect[0].x2 = rect->x2;
	msg.dirt.rect[0].y2 = rect->y2;

	hyperv_sendpacket(hdev, &msg);

	return 0;
}

static int hyperv_get_supported_resolution(struct hv_device *hdev)
{
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct synthvid_msg *msg = (struct synthvid_msg *)hv->init_buf;
	struct drm_device *dev = &hv->dev;
	unsigned long t;
	u8 index;
	int i;

	memset(msg, 0, sizeof(struct synthvid_msg));
	msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
		sizeof(struct synthvid_supported_resolution_req);
	msg->resolution_req.maximum_resolution_count =
		SYNTHVID_MAX_RESOLUTION_COUNT;
	hyperv_sendpacket(hdev, msg);

	t = wait_for_completion_timeout(&hv->wait, VMBUS_VSP_TIMEOUT);
	if (!t) {
		drm_err(dev, "Time out on waiting resolution response\n");
		return -ETIMEDOUT;
	}

	if (msg->resolution_resp.resolution_count == 0) {
		drm_err(dev, "No supported resolutions\n");
		return -ENODEV;
	}

	index = msg->resolution_resp.default_resolution_index;
	if (index >= msg->resolution_resp.resolution_count) {
		drm_err(dev, "Invalid resolution index: %d\n", index);
		return -ENODEV;
	}

	for (i = 0; i < msg->resolution_resp.resolution_count; i++) {
		hv->screen_width_max = max_t(u32, hv->screen_width_max,
			msg->resolution_resp.supported_resolution[i].width);
		hv->screen_height_max = max_t(u32, hv->screen_height_max,
			msg->resolution_resp.supported_resolution[i].height);
	}

	hv->preferred_width =
		msg->resolution_resp.supported_resolution[index].width;
	hv->preferred_height =
		msg->resolution_resp.supported_resolution[index].height;

	return 0;
}

static void hyperv_receive_sub(struct hv_device *hdev)
{
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct synthvid_msg *msg;

	if (!hv)
		return;

	msg = (struct synthvid_msg *)hv->recv_buf;

	/* Complete the wait event */
	if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
	    msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE ||
	    msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
		memcpy(hv->init_buf, msg, VMBUS_MAX_PACKET_SIZE);
		complete(&hv->wait);
		return;
	}

	if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
		hv->dirt_needed = msg->feature_chg.is_dirt_needed;
		if (hv->dirt_needed)
			hyperv_hide_hw_ptr(hv->hdev);
	}
}

static void hyperv_receive(void *ctx)
{
	struct hv_device *hdev = ctx;
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct synthvid_msg *recv_buf;
	u32 bytes_recvd;
	u64 req_id;
	int ret;

	if (!hv)
		return;

	recv_buf = (struct synthvid_msg *)hv->recv_buf;

	do {
		ret = vmbus_recvpacket(hdev->channel, recv_buf,
				       VMBUS_MAX_PACKET_SIZE,
				       &bytes_recvd, &req_id);
		if (bytes_recvd > 0 &&
		    recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
			hyperv_receive_sub(hdev);
	} while (bytes_recvd > 0 && ret == 0);
}

int hyperv_connect_vsp(struct hv_device *hdev)
{
	struct hyperv_drm_device *hv = hv_get_drvdata(hdev);
	struct drm_device *dev = &hv->dev;
	int ret;

	ret = vmbus_open(hdev->channel, VMBUS_RING_BUFSIZE, VMBUS_RING_BUFSIZE,
			 NULL, 0, hyperv_receive, hdev);
	if (ret) {
		drm_err(dev, "Unable to open vmbus channel\n");
		return ret;
	}

	/* Negotiate the protocol version with host */
	switch (vmbus_proto_version) {
	case VERSION_WIN10:
	case VERSION_WIN10_V5:
		ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN10);
		if (!ret)
			break;
		fallthrough;
	case VERSION_WIN8:
	case VERSION_WIN8_1:
		ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN8);
		if (!ret)
			break;
		fallthrough;
	case VERSION_WS2008:
	case VERSION_WIN7:
		ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN7);
		break;
	default:
		ret = hyperv_negotiate_version(hdev, SYNTHVID_VERSION_WIN10);
		break;
	}

	if (ret) {
		drm_err(dev, "Synthetic video device version not accepted %d\n", ret);
		goto error;
	}

	if (hv->synthvid_version == SYNTHVID_VERSION_WIN7)
		hv->screen_depth = SYNTHVID_DEPTH_WIN7;
	else
		hv->screen_depth = SYNTHVID_DEPTH_WIN8;

	if (hyperv_version_ge(hv->synthvid_version, SYNTHVID_VERSION_WIN10)) {
		ret = hyperv_get_supported_resolution(hdev);
		if (ret)
			drm_err(dev, "Failed to get supported resolution from host, use default\n");
	} else {
		hv->screen_width_max = SYNTHVID_WIDTH_MAX_WIN7;
		hv->screen_height_max = SYNTHVID_HEIGHT_MAX_WIN7;
	}

	hv->mmio_megabytes = hdev->channel->offermsg.offer.mmio_megabytes;

	return 0;

error:
	vmbus_close(hdev->channel);
	return ret;
}